Street Routs Figure 1 shows a partial map of the streets in New York City. (Such maps are discussed in Chapter 5.) A tourist starts at point A and selects at random a shortest path to point B. That is, they walk only south and east. Find the probability that
(a) they pass through point C.
(b) they pass through point D.
(c) they pass through point C and point D.
(d) they pass through point C or point D.
Figure 1
Figure 2
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